This was my 3rd pair of speakers. As you can see, they're 3-way, with
a 8" woofer, midrange, and tweeter. The midrange is a sealed-back
style and the tweeter is piezoelectric with an acoustic lens. The lens
improves the pattern greatly, spreading out the sound better. The
woofer is a bass-reflex, obviously because there's a port above the
drivers. Construction is MDF with fir stiffeners. I chose this shape
to minimize parallel faces inside the box. Though the woofer is only
8", it's good down below 30Hz due to the heavy polypropylene cone. Too
bad Pioneer stopped making that driver.